Electrical hand tool machine with non-contacting electrical manual control switch

ABSTRACT

An electrical hand tool machine ( 1 ) having an assembly ( 2 ) vibrating along an axis of vibration (A), a non-contacting electrical manual control switch ( 3 ) with an operating means ( 4 ) and a sensor switch ( 5 ), wherein the sensor switch ( 5 ) is connected non-vibrating with an at least pivotable switching means carrier ( 6 ), whose axis of pivot (S) is oriented along the axis of vibration (A) and which can be manually controlled by the operating means via a pivot transmitting means ( 7 ) that is limited axially displaceable

BACKGROUND OF THE INVENTION

[0001] The invention relates to an electrical hand tool machine having a non-contacting electrical manual control switch, in particular an at least partially percussive chisel hammer or combination hammer.

[0002] In electrical hand tool machines, which are exposed to both high dust loads and strong vibrations because of their intended uses, mechanical contact switches are subject to high wear.

[0003] According to U.S. Pat. No. 5,014,793, an electrical hand tool machine is disclosed that is controlled by a manual control switch, whose operating means operates mechanical piezo-sensors for actuating a power switch. The pressure sensors are in mechanical contact with the operating means, whereby vibrations can be transmitted to the operating means.

[0004] According to DE 4 401 664, a combination hammer having a non-contacting electrical manual control switch has a non-contacting electrical Hall sensor switch that is controllable, according to DE 1 994 215, directly by a cam control mechanism, said sensor being non-vibrationally connected via the housing with the operating means. The sensor switch must be connected to the housing to accomplish this.

SUMMARY OF THE INVENTION

[0005] The object of the invention is to provide a technologically simple, non-contacting electrical manual control switch, whose sensor switch is insensitive to vibrations relative to the operating means.

[0006] This object is achieved essentially by an electrical hand tool machine having a module vibrating along an axis of vibration that has a non-contacting electrical manual control switch with an operating means and a sensor switch, wherein the sensor switch is non-vibrationally connected to an at least pivotable switch carrier, whose pivot axis is oriented along the axis of vibration and which can be manually controlled by the operating means using a pivot transmitting means that is axially displaceable limited along the axis of vibration.

[0007] By virtue of the switching means carrier being non-vibrational relative to the sensor switch and manually controllable by the operating means that is limited axially displaceable along the axis of vibration, there is an isolation of vibration between the operating means and the sensor switch, whereby the latter can vibrate relative to the housing without adversely affecting the switching function of the sensor switch or the operating means.

[0008] Advantageously, the switching means carrier with the operating means form a rotationally pivoting coupling, preferably, in the form of a coupling pin protruding axially eccentrically from the switching means carrier, said pin engaging in a coupling guide of the operating means, whereby the non-contacting electrical manual control switch is combined with an operating means displaceably guided in the housing of the electrical hand tool machine only at the time of final assembly.

[0009] By virtue of an appropriate geometry of the coupling guide, the result is an advantageous transformation of movement between the operating means and the switching means carrier, whereby with a coupling guide in the form of a guide slot a sliding switch displaceable transverse to the axis of vibration can easily be realized.

[0010] Advantageously, the sensor switch is connected to the vibrating assembly; it is cast directly in a motor control electronics, whereby, preferably, the sensor switch is an integrated component of a vibrationally insensitive motor control electronics, which contributes optionally to the vibrational mass.

[0011] The switching means carrier is advantageously configured as a bilateral, limited rotationally pivoting swivel contactor, whereby a switching means spaced transverse relative to the axis of pivot can be displaced only within an arc delimited by two end positions, which can be associated with switching positions.

[0012] Advantageously, the switching means carrier is stabile in at least one switching position relative to the sensor switch. Preferably, the switching means carrier is bistable in exactly two switching positions, and elastically biased, whereby the switching positions are not adversely affected by vibrations.

[0013] Advantageously, a flat spring for biasing the switching position is arranged between the switching means carrier and the sensor switch, said spring being technically simple to manufacture.

[0014] Advantageously, the switching means are configured as permanent magnets and the sensor switch as Hall sensor switches that are insensitive to dust.

SUMMARY OF THE INVENTION

[0015] The invention will now be more completely described with reference to the drawings, wherein:

[0016]FIG. 1 shows an extract of a vibrating electrical hand tool machine, in accordance with the invention; and

[0017]FIG. 2 shows a detail view of the non-contacting manual control switch viewed along the Line II-II of FIG. 1.

DETAILED DESCRIPTION OF THE INVENTION

[0018] According to FIG. 1, a percussive electrical hand tool machine 1 (implied only) having an assembly 2 vibrating along an axis of vibration A has a non-contacting electrical manual control switch 3 having operating means 4 and a sensor switch 5.

[0019] The sensor switch 5 is non-vibrating connected to a rotational pivotable switching means carrier 6, whose axis of pivot S is oriented parallel to the axis of vibration A. By a pivot transmitting means 7 that is limited axial mobile along the axis of vibration A, said means being in the form of a rotationally swiveling switch having a coupling pin 8 protruding eccentrically from the switching means carrier 6, which engages in a coupling guide 9 of the operating means 4, the manual control switch 3 can be manually operated from a handle 10 of the housing 11 of the electrical hand tool machine 1. By virtue of the operating means 4 displaceable vertical to the plane of the illustration, said means being in the form of a sliding switch, there is a transformation of movement by the coupling guide 9 in the form of a guide slot running radially to the axis of pivot S, said transformation being between the linear limited displaceable operating means 4 and the rotational pivotable switching means carrier 6. The sensor switch 5 is connected to the vibrating assembly 2 such that it is cast directly in a vibrational insensitive motor control electronics 12, which contributes to the vibrational mass of the vibrating assembly 2.

[0020] According to FIG. 2, the switching means carrier 6 is configured as a bilateral limited pivotable swivel contactor with a switching means 13 arranged transverse to the axis of pivot S, in the form of two anti-parallel oriented permanent magnets. The switching means carrier 6 is bistable elastically biased relative to the sensor switch 5 in both positions ON/OFF by a flat spring 14. The switching means carrier is displaceable by virtue of end stops 15 a, 15 b only within an arc X delimited by the two associated end positions I, II vis-á-vis the sensor switch 5 configured as differential Hall sensor switches, said sensor switch being cast in one casting mass 16 of the motor control 12. 

What is claimed is:
 1. An electrical hand tool machine having an assembly (2) vibrating along an axis of vibration (A), a non-contacting electrical manual control switch (3) with an operating means (4) and a sensor switch (5), wherein the sensor switch (5) is connected non-vibrating with an at least pivotable switching means carrier (6) with an axis of pivot (S) oriented along the axis of vibration (A) and being manually controlled by the operating means via a pivot transmitting means (7) that is limited axially displaceable along the axis of vibration (A).
 2. The electrical hand tool machine of claim 1, wherein the switching means carrier (6) and the operating means (4) form a rotationally pivoting coupling (7).
 3. The electrical hand tool machine of claim 1, wherein a transformation of movement between the operating means (4) and the switching means (6) results by virtue of an appropriate geometry of the coupling guide (9).
 4. The electrical hand tool machine of claim 1, wherein the sensor switch (5) is connected to the vibrating assembly (2).
 5. The electrical hand tool machine of claim 1, wherein the switching means carrier (6) is a bilateral limited rotationally pivotable swivel contactor.
 6. The electrical hand tool machine of claim 1, wherein the switching means carrier (6) is stable in at least one switching position relative to the sensor switch (5).
 7. The electrical hand tool machine of claim 6, wherein a flat spring (14) for biasing the switching position is arranged between the switching means carrier (6) and the sensor switch (5).
 8. The electrical hand tool machine of claim 1, wherein the switching means (13) is a permanent magnet and the sensor switch (5) is a Hall sensor switch.
 9. The electrical hand tool machine of claim 2, wherein the rotationally pivoting coupling (7) is a coupling pin (8) protruding axially eccentric from the switching means carrier (6).
 10. The electrical hand tool machine of claim 9, wherein the coupling pin (8) engages in a coupling guide (9) of the operating means (4).
 11. The electrical hand tool machine of claim 4, wherein the sensor switch (5) is cased directly in a motor control electronics (12).
 12. The electrical hand tool machine of claim 6, wherein the switching means carrier (6) is bistable in exactly two switching positions. 